Frankie Sandford (born 14 January 1989) was the second oldest member of S Club 8 and was one of the group's more prominent singers. She attended Hall Mead School, in Upminster, and already knew fellow band member Rochelle, a few years before they both got in S Club Juniors.

In 2007 Sandford added two tracks to a MySpace music page, called Bored and Swallow. Later on that year she auditioned for and was accepted into The Saturdays, along with S Club Juniors bandmate Rochelle, and they toured with Girls Aloud in May 2008 as the support act for the Tangled Up Tour. The group's first single, "If This Is Love", was released on 28 July 2008 and reached number eight in the UK. They also released "Up", "Issues", "Just Can't Get Enough" for Comic Relief and "Work". They have so far released 3 albums to critical and commercial success.

On 9 October 2008, Frankie appeared as a guest on Never Mind the Buzzcocks on Phill Jupitus' team.

In 2010, Frankie appeared as a featured artist in the Kids in Glass Houses' song "Undercover Lover" from their album, Dirt

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